77940019 has 8 divisors (see below), whose sum is σ = 84755808. Its totient is φ = 71372160.

The previous prime is 77940013. The next prime is 77940029. The reversal of 77940019 is 91004977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77940019 - 2³ = 77940011 is a prime.

It is a super-2 number, since 2×77940019² = 12149293123440722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77940019.

It is not an unprimeable number, because it can be changed into a prime (77940011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61327 + ... + 62584.

It is an arithmetic number, because the mean of its divisors is an integer number (10594476).

Almost surely, 2^77940019 is an apocalyptic number.

77940019 is a deficient number, since it is larger than the sum of its proper divisors (6815789).

77940019 is a wasteful number, since it uses less digits than its factorization.

77940019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123965.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 77940019 is about 8828.3644578144. The cubic root of 77940019 is about 427.1563194262.

The spelling of 77940019 in words is "seventy-seven million, nine hundred forty thousand, nineteen".